Which client instruction is important when the client is scheduled for a vanillylmandelic acid (vma) test? select all that apply
1. avoid caffeine for 72 hours. 2. a 24 hour urine specimen requires starting with an empty bladder. 3. limit physical exercise throughout the test. 4. avoid all commercially prepared foods for 24 hours prior to testing. 5. a preservative will be added to the collection container so no ice is required?
Hydrochloric acid contributes to protein digestion by supplying H+ which activates pepsinogen, the precursor to pepsin. Pepsinogen is secreted by chief cells in the gastric glands of the body and antrum of the stomach.